My step son had the same issue. I removed both the SIM card and memory card from the phone before turning it back on. Once the phone got past the "SGH-T339" screen it tells you to install the SIM card. Remove the battery and install SIM card and turn phone back on. It has worked ever since.

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Hi,
a 6ya Technician can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US. click here to Talk to a Technician (only for users in the US for now) and get all the help you need. Goodluck!

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disconnect your phone from your computer again, it would take time to charge there, remove your battery, let it cool a little bit and return it back, and charge with your charger. after 5 minutes switch it on and check.

Hello Friend,
It depends on what you mean by charging overnight.
1. When you connect the charger, it shows on the phone that it's charging but after a while if you unplug the charger, it's still not charged: if it's the case, that means the battery is dead and needs to be replaced.
2. When you connect the charger, it doesn't show the phone charging: in this case it can be the charger brocken or the phone charge connector is faulty. you can verify that by moving the charger connector a little bit and see if it will start charging, if not you can try with another charger. if it doesn't charge even with another charger, at this time i will say for sure that the phone charge connector is faulty and needs a repair.
Best Regards,

The battery cell may be completely dead and you need to replace the battery. Because its going completely black again means its actually completely of. So try and change the battery, but make sure you charge it till its completely full before usage. Hope that puts a smile on your face.

Your phone needs reflashing. It seems that your phone's GDFS is dead. If you still have a warranty for your phone than take it to the Service Centre and they will do it for free. If you don't have a warranty than it will be a little expensive.However you can flash your phone by yourself FOR FREE using SeTool2.Read the rest by yourself:http://www.akshayy.com/sonyericsson/tutorials/red-light-blinking-dead-revive-it-to-life/#more-35

i had the same issue when my phone got slightly wet. try taking everything apart (sim card, battery, back). let them dry out for a little bit then after like a day or two put the phone back together. turn it on it will be a white screen for a little bit but give it like 2 or 3 mins and if should come back. I did this for my phone cuz i really needed the pictures off it and it worked! hopefully if will work for you too. GOOD LUCK!

iT'S little cheesy but hey for $10 and free shipping I can eat a lot of cheese.

Just plug your battery into this little clugy thing, plug the thing into the wall, wait until battery is charged and then put your battery back into your phone...presto...for this kind of money who cares if the VX9900 has a dead battery charge port.

I bought two, they were on sale for $7 each. It's ugly and takes a bit of patience but it works.

yeah wokka i had the same problem.what you do is...turn your phone on so it go's to that white screen take the cover off the back and take the battery out while the phone is on,thus cutting the power then plug into charger with the battery out,it took me a bit of stuffing around to get it to work.so just keep taking the battery out then after a few times put the battery back in the phone and plug the charger in without turning the phone on.if the little screen on the front lights up with the "charging sign"then switch the phone on and it should work. if not keep trying.dont know how or why this works but it worked for mine...which was good because these phones take such a great photo only thing that lets them down is that dodgy swivel camera which stuffs up after a while.hope this helps tho....